Chilian mill.



No. 792,161. PATENTED JUNE18, 1905. S. HLPITKIN & J. H. STRATTON.

CHILIAN MILL.

APPLICATION FILED AUG.19, 1904.

3 SHEBTSSHEET 1.

xii

WITNESSES Allornzy No. 792,161. PATENTED JUNE 13,1905.

8. H. PITKIN & J. H. STRATTON.

GHILIAN MILL.

APPLICATION FILED AUG. 19, 1904.

3 SHEETS-SHEET 2.

A [TNESSES w time) 1 NITED STATES STEPHEN HENDERSON PITKTN AND JAMES HUGHES STRATTON, OF AKRON,

Patented June 13, 1905.

PATENT OFFICE.

CLEVELAND, OHIO.

CHILIAN IVIILL.

SPECIFICATION formingpart of Letters Patent No. 792,161, dated June 13, 1905.

Application filed August 19, 1904. Serial No. 221,445.

To all 7077,0727, it warty concern:

Be it known that we, STEPHEN HENDERSON PITKIN and JAMES HUGHES STRATTON, of Akron,in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Ohilian Mills; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to an improvement in Ohilian mills, the objects of the invention being, first, to provide a vertical adjustment of the drive-head in a bottom-drive mill, which can be accomplished while the mill is operating, this adjustment being so arranged that the drive-head may be either raised or lowered; second, to so locate and arrange the main bearings that they can be readily examined and replaced; third, to provide an eflicient method of lubrication and at the same time prevent the oil from coming in contact with the pulp when the mill is fitted for amalgamation; fourth, to provide a drain by which the pulp may be readily removed from the mortar, and, fifth, to provide for increased screening capacity.

lVith these objects in view our invention consists in the parts and combinations of parts and in the details of construction, as will be more fully explained, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in elevation, partly in Section. Fig. 2 is a view in vertical section of our improved apparatus. Fig. 3 is a view in section, showing the manner of mounting the drive-head and grinding-roll shaft, and Fig. 4 is a view in vertical section through a portion of the mortar and die.

The foundation for the machine may be solidly built of masonry or other suitable material, and on this foundation is supported a subbase-casting O, which carries the mortar or pan O, having a centrally-located hollow hub G which projects up considerably above the highest point of the pan or mortar C and extends downwardly to approximately the plane of the top of the subbase O.

The first object of our invention is accom plished by providing a central spindle A free to move vertically, but held from rotating by a feather or spline B in bracket H, bolted to the subbase-casting C, and a thrust-ring D, forged integral with the spindle A for taking the vertical thrust from the drivehead E through antifriction or ball or roller thrustc'ollars F, located on either or both sides of said thrust ring D. On the lower end of spindle A a screw-thread is formed, to which is fitted a nut G, held from vertical movement by subbase O and bracket H. This nut G carries a worm-wheel cast on its periphery and which meshes with a worm I, fixed on shaft 1, which latter is rotated by a handwheel 1 conveniently located outside of the subbase G. Since the central spindle A thus occupies a position usually occupied by the driving-spindle in machines of this class, specially constructed means for rotating the drive-head is therefore required. To provide for this, the main driving-gear K, made in halves, is clamped or keyed to a hollow shaft or sleeve L, which latter is supported above said gear by the hub O of the pan or mortar and below the gear by the bearingO, both the hub O and the bearing O being provided with bronze bushing. The main thrust-bearings F and D are so located at the top of the mill that they may be easily examined by removing cap E, and the ball or roller thrustcollars are also so located with relation to the thrust-ring D that either upward or downward thrusts on spindle A is taken through frictionless bearings. The lower bearing O is made in sections and when bolted together is held in correct alinement by a dowel P, turned on the base-plate.

Lubrication of the thrust-bearings and main sleeve or shaft is effected by an oil-cup Q, located directly over the center of the spindle A. The oil passes from this cup to a cavity R, formed in the top of spindle A, thence through holes S and pipe T, screwed into same, to a point directly over the upper surface of the drive sleeve or shaft L. The top of the sleeve or shaftL is chamfered, so as to form agroove U between it and the inner surface of the drive-head E, as clearly shown in Fig. 2. This groove catches the oil dripping from pipe T and carries it to a vertical groove or grooves V, formed on the inner face of the drive-head E, through which latter the oil passes downwardly between the outer face of the driving shaft or sleeve L and the inner face of the drive-head E, and from thence down along the outer face of the driving sleeve or shaft to the circular groove \V, formed in the upper end of main bearing-bushing M, where it is held in suflicicnt quantity to lubricate this bearing. To prevent the oil from reaching the pulp which may be contained in the body of the pan or mortar, a lip B is cast on the lower end of the drive-head bearing, which obstructs the passage of the oil or tends to prevent it from creeping along the under side of the drivehead and which forms a surface from which the oil will tend to drip to the cavity be low. Should any oil work its way under and around this lip B outward over the lower side of the drive-head, it will be arrested by additional lip C", formed on the under side of the drive-head, from which it will be thrown to the top of the pan or mortar within the confines of the flange D, formed on the upper face of the raised portion of the pan or mortar concentric with the hub of the latter and from which it may be drained through an opening formed in the pan within the space bounded by the flange.

The shafts F for the grinding-rolls F are mounted in bearings F, carried in hollow frames F", preferably formed integral with the drive-head E and projecting laterally therefrom at regularintervals. Each roll is rigidly secured to its shaft F and the latter are journaled in the bearings F", carried by the frames F", and are preferably yieldingly supported, so as to permit the rolls to give and yield to accommodate themselves to inequalities in the thickness of the lumps of material upon which the rolls are operated.

The method of lubricating the shaft-bearings F is essentially the same as in former mills. To prevent oil from working its way along the shafts F to the inner faces of the rolls and thence to the pan or mortar, an oilthrower G is formed on the shaft, which throws the oil into the cavity H, formed in the shaft-bearing, from whence it is drained into the inside of the roller-carrying frame of the drive-head and thence through the bottom of frame to the space formed by flange D on the top of the raised portion of the pan or mortar, from which it is drained, as before noted.

In order to entirely remove the pulp from the mortar, a groove X is cut, extending from the space inside of the ring-dieY, under same, and connecting with the space on the outside of the ring-die. From this groove a hole Z is drilled to the outside of the mortar underneath the trough A, this hole being closed by a plug, except when the mortar is to be drained.

The increased capacity of the machine is obtained by increasing the size of the screenopening and by making the bottom of trough A semicircular in cross-section instead of flat, thus allowing greater capacity with the same amount of water.

In the operation of the apparatus ore from the crusher is fed to the mill. The frames carrying the several 1')ulvcrizing-rolls are revolved, thus causing the rolls to successively pass over and pulverize the ore. As the ore is crushed and mixed with water the action of the rolls and scrapers will cause the pulp to splash against the screen, where the liner particles will pass through and fall into the trough A from which they are conveyed to the chute A and delivered to a concentrating table, jig, or classifier, as the case may be. The coarser particles will drop back into the mill, and the splash caught by the shield Q" will drop down onto the sieves and pass through the same or, if too coarse to pass through the screens, will fall back into the mill.

It is evident that changes in the construction and relative arrangement of the various parts might be made without avoiding our invention, and hence we would have it understood that we do not restrict ourselves to the particular construction and arrangement of parts shown and described; but,

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is*

1. The combination with a pan or mortar, a drive-head carrying crushing-rolls and a driving-sleeve having a feather connection with said drive-head, of a spindle passing centrally through the driving-sleeve and engaging the drive-head, and means engaging said spindle near its lower end 'for adjusting same vertically.

2. The combination with a pan or mortar, a drive-head carrying crushing-rolls and a driving-sleeve having a feather-and-groove connection with said drive-head, of a spindle passing centrally through the driving-sleeve and provided at its upper end with a thrustring which latter engages the drive-head, and means engaging said spindle near its lower end for adjusting same vertically.

3. The combination With a pan or mortar, a drive-head carrying crushing-rolls and a driving-sleeve having a feather-and-groove connection with said drive-head, of a spindle passing centrally through the driving-sleeve and provided at its upper end with a thrustring, anti'friction-bearings located within the drive-head and engaging the upper and lower faces of said thrust-ring, and means engaging said spindle near its lower end for adjusting same vertically.

4. The combination with a pan or mortar,

a drive-head carrying crushing-rolls and provided with a removable cap, and a drivingslecve having a spline-and-groove connection with head, of a spindle passing through the drive-head and provided with a thrust-ring, the latter resting within the removable cap, and means engaging the lower end of said spindle for adjusting same vertically.

5. The combination with a pan or mortar, a drive-head carrying crushing-rolls and provided with a removable cap, and a drivingsleeve having a spline-and-groove connection with head, of a spindle passing throughthe drive-head and provided with a thrust-ring, the latter resting within the removable cap, antifriction-bearings within said cap above and below the thrust-ring and engaged by the latter and means engaging the lower end of said spindle for adjusting same vertically.

6. The combination with a pan or mortar having a central bearing or hub, an annular flange on its raised central portion, and an opening adjacent to said flange, of a drivehead, a hollow driving-sleeve having a featherand-groove connection with the drive-head, a spindle connected with the drive-head and having an oil-duct leading from its upper end to a point above the hollow driving-sleeve, a small pipe leading from said duct and adapted to discharge the oil onto the upper end of the hollow driving-sleeve, and a depending flange on the driving-head for causing the oil to drop onto the pan or mortar within the confines of the annular flange on the latter.

7 The combination with a pan or mortar having a central hearing or hub, the upper end of which is chamfered, of a drive-head, a

hollow sleeve passing through the hub of the pan or mortar and having a feather-and-groove connection with the drive-head, a spindle engaging the drive-head and having a thrustring for supporting the latter, the said spindle having an oil-duct leading from its upper end to a point above the upper end of the hollow sleeve, a short pipe for discharging the oil in said duct onto the chamfered upper end of the hollow shaft or sleeve, and a flange on the drive-head and engaging the driving shaft or sleeve for directing the oil down to the chamfered upper end of the hub of the pan or mortar.

8. The combination with a pan or mortar having a central hub, a raised portion adjacent to the hub, an annular flange on said raised portion and an opening through said raised portion adjacent to the flange, of a drive-head having a series of hollow frames, a bearing in each frame, a shaft journaled in each bearing and carrying a pulverizing-roll, an oil-throwing flange secured on said shaft and moving Within a groove in said bearing and outlet from said groove for discharging the oil into the hollow frame, and an outlet from the latter for discharging the oil onto the pan within the space embraced by the flange.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

STEPHEN HENDERSON PITKIN. JAMES HUGHES STRATTON.

Witnesses:

W. G. HILDEBRAN, l/V. WV. WALLACE. 

